Genetics In a hypothetical insect species, eye color may be purple or red, and w
ID: 189756 • Letter: G
Question
Genetics In a hypothetical insect species, eye color may be purple or red, and wings may be long or short. The following table shows the results of two crosses where the parents were obtained from a mixed population that did not breed true.
Parents
Progeny
Cross 1
Red long male
Red, long female
Males: one half red, long; one half purple long
Females: all red, long
Cross 2
Red short male
Purple long female
Males, all purple short
Females: all red eyed, short
What is the mode of inheritance for eye color for this insect?
What is the mode of inheritance for wing size?
Assuming that true breeding lines are used which of the following crosses would produce an F2 generation that confirms the mode of inheritance for both traits?
Purple short male X red long female
Red short male X red short female
What phenotypic ratio would you expect to see in the F2 generation?
Parents
Progeny
Cross 1
Red long male
Red, long female
Males: one half red, long; one half purple long
Females: all red, long
Cross 2
Red short male
Purple long female
Males, all purple short
Females: all red eyed, short
Explanation / Answer
The eye colour gene is autosomal and red is dominant to purple.
The wing size gene, on the other hand is X-linked with short being dominant to long.
A cross of red long female with purple short male will confirm the mode of inheritance for both the traits.
The phenotypic ratio of the F2 generation will be: males: all red and long and female: all red and short.
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